Rod-packing.



No. 894,739, PATNNTBD JULY 2s, 1908.

T. A. JOHNSTON.'

Y NOD PACKING. APPLICATION FILED DEO. 28,1190?.

MWA

UNITED sTATrs PATENT Ormea.

THOMAS A. JOHNSTON, O CHADRON, NEBRASKA, ASSIGNOR OF ONE-FOURTH TO THOMAS L..

FINLEY, OF LONG PINE, NEBRASKA.

Ron-PACKING.

Specification of Letters Patent'.

Patented July 28, 190 8.

Application led December 28,` Serial No.. 408,346.

To all whom it may concern: l Be it known that I, THOMAS A. JOHNSTON a citizen of the United States', residing at Chadron, in the county of Dawes and State of Nebraska, have invented certain new and useful Improvements in Rod-Packing, of which the following is a specification.

This invention relates-to a rod-packing', and has for its object certain novel improvements over the construction disclosed in my Patent N o. 872,132, dated Nov. 26, 1907, as will appear more fully hereinafter.

In the accom anying drawing, Figure 1 is an end view o the invention. Fig. 2 is a side elevation.

Referring specifically to the drawin 5 denotes a stufIing-box on the cylinder-'cad 6 through which the rod 7 passes. The opening 8 in the cylinder-head through which the rod passes into the stuffingbox is made large enough to permit vibration of the rod.`` On the Outside'ofthe 'cylinder-head is secured a casing 9 which forms a second stuffing-box. The inner end wall of the casing fits 'over the outer open end offthel stulin -box 5 and closes the same. In the end wa ls of the casingare openings 10 through which the rod 7 passes, and said openings are large enough to permit vibration ofthe rod.

A s in Patent No. 872,132, the casing 9 is in two sections which are indicated at 11 and 12, respectively. "The two sections are connected by, bolts 13 'passing through flanges 14 formed on the sect1ons,.and they are fastened to the cylinder-head 6'by screwing said bolts.

there'into. or in any other suitable manner.

On one side of the casin 9 is a neck 15 having an opening 16 w ich communicates with the inside of the casing. The neck is threaded on the outside to receive a cap 17V for closing it. On the top of the cap Ais alug -18 to form 'the holdfor a wrench for putting lon or taking off the cap.` x The neck 15 is also in two sections or halves, one of. which is on the part 1-1, and the otherv on the art 12 of the casing. The threads on the nec sections are soJ arranged that their continuity will not be interrupted when the stuiing-box sections are assem led. The cap also assists to hold the sections together.

Inside the stuffing-box 5 ar'e packing-rings 19 and 2 0', respectively. The ring 19'has one of its ends in contact with the inner end wall of ythe casing9, and on the other end it is cup- Fig. 3 is a longitudlnal section. Fig. 4 is avertical section.-

rod 7 and t'akes upwear of that which is in contact with the rod.

The diameter that of the stufling-box 5' in order that the rin s may vibrate with the rod 7.

. ithin the stuffing-box 9 is arranged a cylindrical casin 22 which is open at both of lts endsand enclrcles the rod7. This casing has atubular stem 23 extending into the opening 16 of the neck. The stem is threaded on the mside to receive a closing plu 24, and it also lcontainsa spring-pressed folwer 25, the spring 25 being inter Osed between the follower and the bottom o the plug 24. The plug also serves to regulate the tension ofthe spring. The .casing 22 is spaced from the inner walls of the stuffing-boxso that it may vibrate therein with the rod 7.

' Inside the .casing 22 and encircling `the tively. The packing-ring 26 its 0n one side against the outer end wall of the casi-ng 9 and the ring 27 fits on one side against the inner end wall of said casing. The opposite ends of both of said `rings are cup-shaped as clearly shown in Fig. 3; The cupped ends of the rings are on the inside of the casing 22 and against said ends are placed to fit snugly., thereagainstl conical packing-rings 28 encircling the rod 7. The inside of the casing 22 not occupied by the packing-rings herein described, will be filled up to the fol- .lower v24 with small shot or spheres 29 mixed with graphite. The shotl or spheres will be of suitable anti-friction metal or graphite and the-like. The spring-pressed follower 24 compresses the shot around the portion The rings 2 6 and 27 project beyond .the ends of .the casing 22 and are held tightly against the end Walls of the casing 9 .by means of springs 30. On the outside of the casing 22 the rings have flanges 31 .and-said casing is formed with a flange 32. The

springs are coiled around the casing 22 and their respective ends abut against the flanges 31 and 32. VThe springpressed spheres also serve to press the cup-shaped and conical packing-rings together.

The parts-inside the stuffing-box 9 form a steam-tight packing for the rod and effectually prevent leakage, but if any such should take place it would be held in the casing. As the casing 22 is loose in the stuffing-box 9, it is free to move with the rod if the latter should have any lateral motion or vibration, and such movement ofthe casing will not impair the efficiency of the packing. The stuffing-box is made in twol sections, as described in order that the parts inside thereof within the stuffing-box 9.

If desired, the stuffing-box 9 may be fitted with a lubricating device 33 communicating vwith the opening 1() for the purpose of lubricating the rod 7,. In some cases the conical packing-rings may -be dispensed with. The cap 17 ma be fastened by bolts if desired instead of eing screwed on as shown in the drawing. The rod is lubricated by keeping the space between the two stuffing-boxes filled with a lubricant.

In vmy former Patent No. 872,132 the spring for pressing the packing against the end walls of the stuffing-box is on the inside of the loose casing among the spherical packing which has a tendency to interfere with the proper function of the latter. This objectlon 1s entirely overcome by placing the springs on the outside of the loose casing and forming the packing rings 27 with the circumferential terminal flanges 31 which are engageable by said s rings for pressing the rings against the en walls of the stuffingbox. This arrangement leaves the spherical packing 29 free to perform its proper function.

I claim:-

1. A rod-packing comprising a stuffingbox, a casing loose therein and surrounding the rod, a packing around the rod inside the casing and project-ing from the ends thereof, andl means locatedion the outside of the casing for holding the projecting ends of the packing in contact with the end-walls of the stuffing-box.

2. A rod-packing comprising a stuffingboX, a casing loose therein and surrounding the rod, a acking inside the casing around the rod an( projecting from the ends thereof, and springs outside the casing bearing against the projecting ends of the packing for pressing the same against the end walls of the stuffing-box.

3. A rod-packing comprising a stuffingbox, a casing loose therein and surrounding the rod, spaced packing-rings inside the casing around the rod and projecting from the ends of the casing, springs engageable with the projecting ends of thc rings for pressing the same against the end-walls of the stuffing-box, and a packing of spheres inside the casing around the rod between the rings.

4. The combination with the stufiing-box of a cylinder-head,` of a casing fitting over the open end thereof and having openings through which the rod passes, packing-rings vinside the stufiingbox-encirc ing the rod,

means for holding said rings in contact with the end of the casing, and a packing inside the casing.

In testimony whereof I affix my signature, in presence of two witnesses.

THOMAS A. JOHNSTON. Witnesses:

EDWIN D. CRrrEs, B. F. IITMAN. 

